+1 for Vaillant, especially if your not totally confident in what the heat loss will be, there does not seem to be much penalty for performance if you have a vaillant arotherm that’s a little bit too big. The 5kW might be fine as it can actually output over 6kW in practice. The 7kW (~8.5 kW in practice) is probably a bit big but does it matter? (see Is an oversized Vaillant a problem?).
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